1
Lubricant filling plug
4
Collection receptacle
2
Lubricant filling plug
5
Lubricant drain plug
3
Lubricant drain plug
Drain the lubricant
Consult with Pfeiffer Vacuum Service about shorter maintenance intervals for extreme loads or impure
processes.
1. Shut down the vacuum pump and allow it to cool if necessary.
2. Vent the vacuum pump to atmospheric pressure via the intake side.
3. Unscrew the lubricant filler screws.
4. Place the collection receptacle underneath.
5. Unscrew both lubricant filler screws.
6. Fully drain the lubricant.
7. Screw the drain screws back in.
– Tightening torque:
max. 50 Nm
Filling with lubricant
1. Fill new lubricant on both sides until the max. fill level is reached
(see chapter “Filling with lubri-
2. Screw in the lubricant filler screws.
– Tightening torque:
max. 50 Nm
7.4 Changing the sealing oil
A sealing oil change is required for roots pumps with RSSR.
A decreasing oil level in the oiler and an oil leak below the lantern indicate a defective
external
radial
shaft seal ring. As long as the oil loss on the oiler is compensated, you may continue operating the roots
pump for a certain amount of time.
Procedure in the event of significant oil loss
A decreasing oil level without visible loss of oil underneath the roots pump is an indication of a worn
internal
radial shaft seal ring and, as a result, an impermissibly high oil level in the bearing chamber.
► Arrange for maintenance to be carried out by Pfeiffer Vacuum Service, during which all 3 radial
shaft seal rings are generally replaced.
Maintenance
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